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(N0 Mode 1.) 2 Sheets -Sheet 1. J. A. PEARCE. ORE PULVERIZE'R.

Patent ed Feb. 16, 1892.

iINITED STATES PATENT OFFIQE.

JACOB A. PEARCE, OF DENVER, COLORADO, ASSIGNOR, TO THE MECHANICS MILLING AND AMALGAMATING COMPANY, OF SAME PLACE.

ORE-PULVERIZER.

SPECIFICATION forming part of Letters Patent No.469,065, dated February 16, 1892.

Application filed April 27, 1891. Serial No. 390,540- (No model.)

To aZZ whom it may concern:

Be it known that I, JACOB A. PEARCE, a citizen of the United States, residing at Denver, in the county of Arapahoe and State of Colorado, haveinvented certain new and usef ul Improvementsin Ore-Pulverizers,of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to machines for pulverizing or reducing to fine dust ores, mica, gypsum, carbons, or any brittle substance whose reduction may be desirable; and it has for its object to provide a simple, cheap, .and yet most effective machine of this class.

To these ends said invention consists in the pulverizer' having the construction and combination of parts as hereinafter specified.

In the accompanying drawings, Figure 1 shows my pulverizer in plan view, parts being broken away in order to more clearly illustrate the same. Fig. 2 is a perspective View of a portion of the machine, looking from the feeding end thereof. Fig. 3 is a central longitudinal section. Fig. 4 is a transverse section on line a m, Fig. 3; and Fig. 5 is a detail perspective view.

My invention contemplates the employment of a slowly-revolving hollow cylinder of peculiar construction, into which the material to be pulverized is fed, and a rapidly-revolving beater arranged concentrically within the cylinder. The latter, as shown, consists of two heads A A, to the horizontally-projecting portions a a, of which is bolted a series of comparatively narrow strips B. For a distance equal to the space between the portions cm of the two heads these strips are reduced in width, so as to leave long narrow spaces or slots C between adjacent ones. To vary the size of these spaces, long and thin barsD are secured adjustably to the outer faces of the strips 13, so as to be capable of projection to a greater or less degree over said spaces. The securing means consist of bolts E, passing through elongated openings or slots d in the bars into the strips B. Two of said bars are provided on each of the latter, and the opposite bars on adjacent strips control the spaces 50 between the same. As shown clearly in Fig.

4, the edges of the strips B are beveled, so that projection or gudgeon extending outwardly from each head A into bearings or boxes F F, provided on suitable castings F F, which serve as frames or supports for the apparatus. One of the projections or gudgeons (designated by a) is larger than'the other and contains rather a l'argc inwardly-flaring cylindrical opening a through which the material to be pulverized may be fed into the cylinder from a suitable hopper G, which discharges into said opening.

WVithin the cylinder and concentric therewith is a revolving beater consisting of along hub H and four radially-extending wings h. The latter are of such radial extent as not to touch the ribs 1) on the strips ]3, and their length in an axial direction, with one exception, is the same as that of said ribs. One of said wings is extended into the opening in the gudgeon a, where it is formed into aspiral conveyer h to pass the material as it is discharged into said opening from the hop per into the cylinder. The hub I-I also'extends into said openings, but is given a tapering form therein in order to afford ample space for the reception of the material to be operated on. The beater is mounted on or carried by a shaft I, journaled in suitable boxes or bearings f f f, provided on the castings F. On the shaft I, near the end farthest from the hopper; and in a space left in the casting F between the boxes f,is abandpulley J, by means of which the beater may be revolved, while to revolve the cylinder the head A near the pulley J carries a bandwheel K, which may be, as shown, a portion projected or extended outward from said head. Extending between circumferential flanges on the cylinder-heads and inclosing the cylinder is a cylindrical housing L.

Briefly, the operation of my invention is as follows: With the cylinder revolving slowly in the direction of the arrow, Fig. 4:, and the beater revolving rapidly in the reverse or the same direction,the material to be pulverized is fed from the hopper into the opening a in the gudgeon it. Here it is engaged by the spiral or screw conveyer on the beater and forced thereby into the cylinder; The internally-projecting ribs 1) will there catch it, the

concave faces thereof facilitating this, and

carry it upward to fall upon the beater and by the wings of the same be pounded or beaten against the ribs 19 on the cylinder. When beaten or pounded to the required fineness, to be determined by the area of the slots or spaces 0, the material will be discharged from the cylinder through the latter into the casing or housing K, from which it can be removed in any suitable manner, as by a suction-pipe or screw conveyer.

I desire to call attention to the fact that the wings of the beater not only serve to pound the material, but by reason of their rapid rotation operate as fans to drive or blow the powdered material through the spaces or slots 0, so that its lodginent or packing in the cylinder is obviated. The passage through the latter is aided by reason of the beveling of the edges of the strips B which form such spaces.

Having thus described my invention, what I claim is 1. The combination of ashaft and bearings therefor, a revolving beater on said shaft, provided with radial longitudinal wings h, cylinder-heads A A, provided with outwardlyprojecting hollow gudgeons, through which the said shaft passes, said gudgeons being journaled upon the said bearings and adapted to revolve independently of the shaft, a cylinder carried by the heads A A and inclosing the revolving beater, said cylinder being pro- Vided with longitudinal slots and inwardlyprojecting longitudinal ribs, a stationary hopper mounted on one side of the bearings and extending into one of the hollow gudgeons on the cylinder-heads, and a housing, substantially as and for the purpose described.

2. The combination of a revolving beater, a cylinder inclosing the beater and provided with longitudinal slots, adjustable strips secured to this cylinder to Vary the size of the slots, and a housinginclosing this cylinder, as and for the purpose set forth.

3. In combination, the revolving cylinder, two cylinder-heads having ajournaling-gudgeon each, suitable boxes for the gudgeons, the series of separated strips having inwardlyprojecting triangular-shaped ribs secured to said heads, the radially-Winged hub forming a beater within said cylinder, one of the wings being at one end formed into'a spiral or screw conveyer and projectingv into an opening in one of said gudgeons, and suitable means to rotate the cylinder and beater independently, substantially as described In testimony whereof I affix my signaturein presence of two witnesses.

JACOB A. PEARCE.

'Witnesses:

ANTHONY ROY, J AY SCHERMERHORN. 

